@InProceedings{SilvaLaRo:2017:PbSuSt,
author = "Silva, Erasmo Assump{\c{c}}{\~a}o de Andrada e and La Rocca,
Giuseppe C.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "PbSnTe surface states in the envelope-function approximation",
year = "2017",
organization = "Brazilian Workshop on Semiconductor Physics, 18. (BWSP)",
abstract = "We investigate theoretically the surface states of the topological
insulator (TI) Pb1-xSnxTe compound within the envelope-function
approximation. Heterostructures with inverted and large-gap
materials are used to model the surfaces of both bulk and thin
films [1]. Spin-orbit (SO) interaction is considered within the
Dimmock kp model for the lead-salts, analogous to the Kane model
for the III-V compounds. With standard envelope-function
procedure, employing spin-dependent boundary conditions, and for
the main surface directions (i.e., [111], [100] and [110]) we
calculate the dispersion relation of the band of surface states
laying in the PbSnTe bulk band-gap. The dependence with the
thin-film thickness and with different models for the interface
with the vacuum is studied. It is shown that simple expressions
describing the typical TI Dirac-cone structure, with SO
momentum-spin locking, are in this way easily obtained. For thin
films, the opening of the Dirac-cone gap [2] and the
Rashba-splitting of the surface states is clearly reproduced, and
the surface-direction dependence discussed. In conclusion, the
model calculation proposed is shown to be transparent and
quantitatively precise enough to be useful in the investigation
and in the application of the electronic properties of these TI
surface states. [1] R. Buczko and L. Cywinski, Phys. Rev. B 85,
205319 (2012). [2] V. Korenman and H. D. Drew, Phys. Rev. B 35,
6446 (1987).",
conference-location = "Maresias, SP",
conference-year = "14-18 ago.",
label = "self-archiving-INPE-MCTIC-GOV-BR",
language = "en",
urlaccessdate = "28 abr. 2024"
}